Corner measuring instrument



FIG. 1 is a top, front and right side perspective view of a corner measuring instrument showing my new deisgn, shown in an acute angle position;

FIG. 2 is a top and rear perspective view, shown in an obtuse angle position;

FIG. 3 is a top plan view;

FIG. 4 is another top plan view, positioned adjacent to a wall portion at a right angle;

FIG. 5 is a bottom plan view, positioned adjacent to a wall portion at an obtuse angle; and

FIG. 6 is a left side elevational view thereof. 

The ornamental design for a corner measuring instrument, as shown and described. 